bin/162332: bsdlabel destroys partitions with indexes over 8

[Eugene Grosbein]

>Number:         162332
>Category:       bin
>Synopsis:       bsdlabel destroys partitions with indexes over 8
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Nov 06 14:10:05 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Eugene Grosbein
>Release:        FreeBSD 8.2-STABLE amd64
>Organization:
RDTC JSC
>Environment:
System: FreeBSD grosbein.pp.ru 8.2-STABLE FreeBSD 8.2-STABLE #13: Sat Oct 22 20:07:08 NOVT 2011 root at grosbein.pp.ru:/usr/local/obj/usr/local/src/sys/DADV amd64

>Description:
	GEOM now support upto 20 partitions within single BSD label.
	To raise default limit (8) one have to create label as such:

gpart create -s BSD -n 20 ad0s1

	But, "bsdlabel -e ad0s1" silently lowers limit down to 8
	and destroys partitions numbered 9 (i) and more even
	if one exits an editor without saving the label.


>How-To-Repeat:
	
	1. Create BSD label with command mentioned above:

gpart create -s BSD -n 20 ad0s1

	2. Use gpart to create 9 partitions within a slice:

gpart add -t freebsd-ufs -s 1G ad0s1
...
gpart add -t freebsd-ufs -s 1G ad0s1

	3. Use "gpart show" to make sure they are all created
	4. Use "bsdlabel -e ad0s1", don't change anything and exit your editor.
	5. Use "gpart show" to see that partition 9 has disappeared.
	6. "gpart add" not refuses to recreate partition 9 as limit is 8 now.

>Fix:

Unknown.
Silent partition deletion in not acceptable, as well as changing of limit.
>Release-Note:
>Audit-Trail:
>Unformatted: